US3811490A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous casting of rimming steel
Assignee: British Steel Corp
•
Filing: 1973-04-05
•
Granted: 1974-05-21
•
Expires: 1993-04-05
Abstract
Abstract In the production of steel by the continuous casting technique, a steel having a negatively segregated outer surface layer is made. An electromagnetic field is applied to the molten steel in the mould by coils surrounding the mould so that the steel is stirred with a rotary motion and passes over the outer solidifying layer in a direction parallel to the longitudinal axis of the cast strand and returns through the centre of the mould. The steel supplied to the continuous casting mould is in a deoxidised or partially deoxidised state.
Inventors
- 👤 M Middleton
- 👤 H Lloyd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:00
CPC Classifications
B; B22; B22D; B22D11/00; B22D11/10; B22D11/11; B22D11/114; B22D11/115
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
136 words
A method for the production of steel having the characteristics of rimming steel comprising pouring molten steel in at least a partially deoxidised condition and having a carbon content below 0.25 percent into a continuous casting mould, electromagnetically stirring the molten steel in the mould with a rotary motion about an axis extending transverse to the direction of movement of the steel through the mould so that the molten steel passes over the outer solidifying layer in a direction substantially parallel to the longitudinal axis of the cast strand and returns through the centre of the mould and a negatively segregated relatively non-porous outer surface layer is produced in the cast strand of steel, and solidifying said cast strand with said negatively segregated relatively non-porous outer layer encasing a core containing a majority of the impurities.
Claim 2
Independent Claim
136 words
A method for the production of steel having the characteristics of rimming steel comprising pouring molten steel in at least a partially deoxidised condition and having a carbon content below 0.25 percent into a continuous casting mould, electromagnetically stirring the molten steel in the mould with a rotary motion about an axis extending transverse to the direction of movement of the steel through the mould so that the molten steel passes over the outer solidifying layer in a direction substantially parallel to the longitudinal axis of the cast strand and returns through the centre of the mould and a negatively segregated relatively non-porous outer surface layer is produced in the cast strand of steel, and solidifying said cast strand with said negatively segregated relatively non-porous outer layer encasing a core containing a majority of the impurities.
Claim 3
Dependent Claim
21 words
A method according to claim 1 in which the steel poured into the mould is in a generally fully deoxidised condition.
Claim 4
Dependent Claim
23 words
A method according to claim 1 in which the pouring is carried out in the presence of an inert gas to prevent reoxidation.
Claim 5
Dependent Claim
25 words
A method according to claim 1 in which pouring is carried out in the presence of a gas of controlled oxygen potential to control reoxidation.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-20 | 1977-11-19 | 1978-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-20 | 1981-11-19 | 1982-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-20 | 1985-11-19 | 1986-05-21 | $7700.00 | Window Closed / Lapsed |